2 Answers
2

The process for getting an old question on a meta site noticed is not different from what is done for a question on the main site.

You edit the question to make it appear in the front page.

You offer a bounty.

Between the two options, the first has the shorter effect: When new questions are posted, the question you wanted to get noticed will vanish again between the other questions. On Meta Stack Overflow, where fewer questions are posted, that question will be noticeable for a longer time.
With the second option, the question will be listed in the "featured" tab until the bounty expires, which means (if I am not wrong) seven days.